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static void
updatechanvol(int chan, const OFVector3D *loc)
{
int vol = soundvol, pan = 255 / 2;
if (loc) {
OFVector3D origin = player1.origin;
float dist = OFDistanceOfVectors3D(*loc, origin);
OFVector3D v = OFSubtractVectors3D(*loc, origin);
float dist = OFDistanceOfVectors3D(origin, *loc);
OFVector3D v = OFSubtractVectors3D(origin, *loc);
// simple mono distance attenuation
vol -= (int)(dist * 3 * soundvol / 255);
if (stereo && (v.x != 0 || v.y != 0)) {
// relative angle of sound along X-Y axis
float yaw =
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